Station details:
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Code: KOA
Latitude:  -6.22414
Longitude:  155.61900
Elevation:    65.0
Depth: 
Name: Kobuan
Region: Bougainville,Papua New Guinea
Status: 

        
Arrival picks statistics
Travel Time Analysis
On the top graph every dot represents the median residual for one month of data. The green line is the overall median; the orange line shows the standard deviation (smad) based on the median absolute deviation (mad), whilst the red line shows twice the standard deviation (2 * smad).
The bottom graph shows the number of residuals for each month. The red columns show the number of residuals whose median (for that month) is outside two standard deviations from the overall median (2 * smad).
Red dots indicate a possible clock error.
Travel time residuals
 

Station comments:
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Checked against station bulletin
XC1R1-VNG
19691207-19721130

Data at the ISC for 5 years between 1969 and 1987.